<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <!-- @mouseenter="enterShow" @mouseleave="leaveShow" -->
      <div @mouseleave="leaveShow" @mouseenter="enterShow" id="ShowIndex">
        <h2 class="all">全部商品分类</h2>

        <div class="sort" v-show="ShowDom">
          <!-- v-loading="loading"   goSearch 事件委托-->
          <div class="all-sort-list2" @click="goSearch">
            <div
              class="item bo"
              id="bgColorDiv"
              v-for="(dataList1, index) in categoryList"
              :key="dataList1.categoryId"
            >
              <h3
                :class="{ cur: currentIndex == index }"
                @mouseenter="changeIndex(index)"
              >
                <a
                  :data-categoryName="dataList1.categoryName"
                  :data-category1Id="dataList1.categoryId"
                  >{{ dataList1.categoryName }}</a
                >
              </h3>
              <div class="item-list clearfix">
                <div class="subitem">
                  <dl
                    class="fore"
                    v-for="dataList2 in dataList1.categoryChild"
                    :key="dataList2.categoryId"
                  >
                    <dt>
                      <a
                        :data-categoryName="dataList2.categoryName"
                        :data-category2Id="dataList2.categoryId"
                        >{{ dataList2.categoryName }}</a
                      >
                    </dt>
                    <dd>
                      <em
                        v-for="dataList3 in dataList2.categoryChild"
                        :key="dataList3.categoryId"
                      >
                        <a
                          :data-categoryName="dataList3.categoryName"
                          :data-category3Id="dataList3.categoryId"
                          >{{ dataList3.categoryName }}</a
                        >
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
      <nav class="nav">
          <a href="###">服装城</a>
          <a href="###">美妆馆</a>
          <a href="###">尚品汇超市</a>
          <a href="###">全球购</a>
          <a href="###">闪购</a>
          <a href="###">团购</a>
          <a href="###">有趣</a>
          <a href="###">秒杀</a>
        </nav>
    </div>
  </div>
</template>

<script>
import throttle from "lodash/throttle";
//mapState  是映射到  store/home.js 中state对象中的属性数据
import { mapState } from "vuex";
export default {
  name: "Navigation",
  data() {
    return {
      currentIndex: -1,
      // loading:true
      ShowDom: true,
    };
  },
  methods: {
    changeIndex: throttle(function (index) {
      //修改当前currentIndex索引值
      //函数节流:在20MS时间之内只能执行一次
      this.currentIndex = index;
    }, 20),
    //事件委派 单击a 路由跳转
    goSearch(event) {
      let node = event.target;
      let { categoryname, category1id, category2id, category3id } =
        node.dataset;
      //categoryName 如果有单独的name属性代表时三级框中一项
      if (categoryname) {
        //路由跳转时 path中name属性跳转
        let location = { name: "searchName" };
        let query = { categoryName: categoryname };
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else {
          query.category3Id = category3id;
        }
        console.log(
          "category1id,category2id,category3id",
          category1id,
          category2id,
          category3id
        );
        //判断：如果路由跳转的时候，带有params参数，捎带脚传递过去
        if (this.$route.params) {
          location.params = this.$route.params;
          console.log("query", query);
          location.query = query;
          this.$router.push(location);
        }
      }
    },
    //鼠标移入三级框中  显示
    enterShow() {
      if (this.$route.path !== "/home") {
        this.ShowDom = true;
      }
    },
    //鼠标移出三级框   闭上
    leaveShow() {
      this.currentIndex = -1;
      if (this.$route.path !== "/home") {
        this.ShowDom = false;
      }
    },
  },
  mounted() {
    if (this.$route.path !== "/home") {
      this.ShowDom = false;
    }
  },
  computed: {
    ...mapState({
      categoryList: (state) => state.home.categoryList,
    }),
  },
};
</script>

<style lang="less" scope>
#ShowIndex{
    width: 210px;
    height: 45px;
}
a:hover {
  text-decoration: none !important;
  color: red;
}
.type-nav {
  border-bottom: 2px solid #e1251b;
  #bgColorDiv:hover {
    background-color: skyblue;
  }

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>
